46VX700U wierd issues

Customer started by complaining about sound cutting in and out.  I started by check all inputs and it occured on all inputs, except coax to tuner, nothing worked through it.  I then replaced Main Board and no change.  I then checked firmware and it is up-to-date.  I then reset TV and no change.  I then unplugged all inputs and power, left overnight with back off and next day set powered up and everything worked fine, even the coax.  I let it run for about six hours with no problems, then I put back of set on and slowly put screws, two at a time, back in, waiting about 15-30 mins between screws.  When I made it half screws in about 20-25 mins everything shut down back to orginal problem.  I contacted toshiba Tech support and was told to take it to another repair center six hours away.  NOT HAPPENING!!!
Is there any way to clear the firmware and start a fresh load???
Is there any way to reload the firmware????
Any Help would be GREAT!!!       Thanks
mjflips

new developments to this issue,  set will error out upon firmware upgrade, ( both by USB flash or network).  After Replacement of Main and power boards due to overheated malfuctions.  Set works fine now for last 48hours of steady use with fan blowing on main board, if fan is shut off set will start to malfuction again within 25 mins.
Is there any one who knows if there is a second fan connection on the main board for the install of a second cooling fan???

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